Exercise bicycle



FIG. 1 is a right side view of an exercise bicycle.

FIG. 2 is a left side view of an exercise bicycle.

FIG. 3 is a rear view of an exercise bicycle.

FIG. 4 is a front view of an exercise bicycle.

FIG. 5 is a bottom view of an exercise bicycle.

FIG. 6 is a top view of an exercise bicycle; and,

FIG. 7 is a left rear perspective view of an exercise bicycle.

The broken lines illustrate portions of the exercise bicycle which form no part of the claimed design. 

CLAIM The ornamental design for an exercise bicycle, as shown and described. 